Regulating system for gas burners

Abstract

A burner system for controlling the gas/air mixture of a burner has a sensor providing a signal dependent on the pressures in gas and air lines supplying the burner. A summing device receives a signal based on the air flow rate and the signal from the sensor, and provides a regulating signal controlling the setting of a gas regulating valve regulating the flow of gas in the gas line.

What I wish to claim is:  
     
       1. A burner system for providing a gas flow and a combustion-air flow to a burner, including: 
       a) a first line ( 10 ) carrying the gas flow;  
       b) a gas regulating valve ( 11 ) in the first line ( 10 ) receiving a regulating signal ( 24 ) and varying the gas flow rate in the first line responsive to the regulating signal ( 24 );  
       c) a second line ( 14 ) carrying the combustion air flow;  
       d) an evaluating device ( 28 ) operatively connected to sense the combustion air flow and to provide an auxiliary signal ( 27 ) depending on the combustion air flow;  
       e) a sensor ( 19 ) connected between the first line ( 10 ) carrying the gas flow and a second line ( 14 ) carrying the combustion-air flow, and providing a signal ( 22 ) dependent on the gas pressure and the combustion air pressure;  
       f) a summing device ( 26 ) receiving the signal ( 22 ) of the sensor ( 19 ) and the auxiliary signal ( 27 ) and providing a sum signal ( 30 ) depending on the sensor signal ( 22 ) and the auxiliary signal; and  
       g) a regulating unit ( 23 ) receiving the sum signal ( 30 ) and generating the regulating signal ( 24 ) for the gas regulating valve ( 11 ).  
     
     
       2. The burner system of  claim 1 , including a fan ( 15 ) providing the combustion air flow and whose rotational speed determines the flow rate of combustion air; and wherein the evaluating device ( 28 ) provides an auxiliary signal ( 27 ) depending on the rotational speed of the fan ( 15 ). 
     
     
       3. The burner system of  claim 2 , including a gas nozzle ( 18 ) in the first line ( 10 ), a flow restrictor ( 17 ) in the second line ( 14 ), a first measuring point ( 20 ) in the first line ( 10 ) upstream of the gas nozzle ( 18 ), and a second measuring point ( 21 ) in the second line ( 14 ) upstream of the flow restrictor ( 17 ), and wherein the sensor ( 19 ) is connected to the first line ( 10 ) at the first measuring point ( 20 ) and the sensor ( 19 ) is connected to the second line ( 14 ) at the second measuring point ( 21 ). 
     
     
       4. The burner system of  claim 1 , including a gas nozzle ( 18 ) in the first line ( 10 ), a flow restrictor ( 17 ) in the second line ( 14 ), a first measuring point ( 20 ) in the first line ( 10 ) upstream of the gas nozzle ( 18 ), and a second measuring point ( 21 ) in the second line ( 14 ) upstream of the flow restrictor ( 17 ), and wherein the sensor ( 19 ) is connected to the first line ( 10 ) at the first measuring point ( 20 ) and the sensor ( 19 ) is connected to the second line ( 14 ) at the second measuring point ( 21 ).